Michael H. Davidson
Insider
First SEC filing: Jan. 2, 2025 · Latest: June 12, 2026
Insider at
Insider transactions
1 buys (P)
9 sells (S)
Net: $-25,101,850
Avg return of open purchases vs now: -44.2%
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Sept. 14, 2026 | NAMSW | P | 10,000 | $22.65 | $226,500 | 792,923 Direct | +1.28% | Acquired | -44.2% (price as of 2026-10-02) |
| June 10, 2026 | BIOA | A | 22,000 | · | · | 22,000 Direct | · | Acquired | (price as of 2026-10-02) |
| March 2, 2026 | NAMSW | M | 443,707 | · | · | 239,267 Direct | -64.97% | Disposed | (price as of 2026-10-02) |
| March 2, 2026 | NAMSW | S | 443,707 | $33.25 | $14,753,258 | 174,144 Direct | -71.81% | Disposed | -62.0% (price as of 2026-10-02) |
| March 2, 2026 | NAMSW | M | 443,707 | · | · | 617,851 Direct | +254.79% | Acquired | (price as of 2026-10-02) |
| Feb. 26, 2026 | NAMSW | M | 183,332 | · | · | 682,974 Direct | -21.16% | Disposed | (price as of 2026-10-02) |
| Feb. 26, 2026 | NAMSW | S | 17,924 | $34.44 | $617,303 | 174,144 Direct | -9.33% | Disposed | -63.3% (price as of 2026-10-02) |
| Feb. 26, 2026 | NAMSW | S | 165,408 | $33.63 | $5,562,671 | 477,783 Direct | -25.72% | Disposed | -62.4% (price as of 2026-10-02) |
| Feb. 26, 2026 | NAMSW | M | 183,332 | · | · | 643,191 Direct | +39.87% | Acquired | (price as of 2026-10-02) |
| Feb. 25, 2026 | NAMSW | M | 58,253 | · | · | 866,306 Direct | -6.30% | Disposed | (price as of 2026-10-02) |
| Feb. 25, 2026 | NAMSW | S | 1,300 | $36.68 | $47,684 | 459,859 Direct | -0.28% | Disposed | -65.5% (price as of 2026-10-02) |
| Feb. 25, 2026 | NAMSW | S | 10,436 | $35.96 | $375,279 | 461,159 Direct | -2.21% | Disposed | -64.8% (price as of 2026-10-02) |
| Feb. 25, 2026 | NAMSW | S | 46,517 | $35.11 | $1,633,212 | 471,595 Direct | -8.98% | Disposed | -64.0% (price as of 2026-10-02) |
| Feb. 25, 2026 | NAMSW | M | 58,253 | · | · | 518,112 Direct | +12.67% | Acquired | (price as of 2026-10-02) |
| Feb. 24, 2026 | NAMSW | M | 64,708 | · | · | 924,559 Direct | -6.54% | Disposed | (price as of 2026-10-02) |
| Feb. 24, 2026 | NAMSW | S | 3,161 | $36.46 | $115,250 | 459,859 Direct | -0.68% | Disposed | -65.3% (price as of 2026-10-02) |
| Feb. 24, 2026 | NAMSW | S | 61,547 | $36.13 | $2,223,693 | 463,020 Direct | -11.73% | Disposed | -65.0% (price as of 2026-10-02) |
| Feb. 24, 2026 | NAMSW | M | 64,708 | · | · | 524,567 Direct | +14.07% | Acquired | (price as of 2026-10-02) |
| Jan. 9, 2026 | TENX | A | 30,000 | · | · | 30,000 Direct | · | Acquired | (price as of 2026-10-02) |
| Jan. 7, 2026 | NAMSW | A | 364,000 | · | · | 364,000 Direct | · | Acquired | (price as of 2026-10-02) |
| Jan. 7, 2026 | NAMSW | A | 81,000 | · | · | 459,859 Direct | +21.38% | Acquired | (price as of 2026-10-02) |
| Jan. 7, 2026 | NAMSW | S | 11,582 | · | · | 378,859 Direct | -2.97% | Disposed | (price as of 2026-10-02) |
| July 1, 2025 | TENX | A | 80,000 | · | · | 80,000 Direct | · | Acquired | (price as of 2026-10-02) |
| June 5, 2025 | BIOA | A | 22,000 | · | · | 22,000 Direct | · | Acquired | (price as of 2026-10-02) |
| March 26, 2025 | NAMSW | M | 38,394 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| March 26, 2025 | NAMSW | A | 38,394 | · | · | 38,394 Direct | · | Acquired | (price as of 2026-10-02) |
| March 26, 2025 | NAMSW | S | 12,258 | · | · | 390,441 Direct | -3.04% | Disposed | (price as of 2026-10-02) |
| March 26, 2025 | NAMSW | M | 38,394 | · | · | 402,699 Direct | +10.54% | Acquired | (price as of 2026-10-02) |
| March 26, 2025 | NAMSW | A | 30,992 | · | · | 364,305 Direct | +9.30% | Acquired | (price as of 2026-10-02) |
| Jan. 7, 2025 | NAMSW | A | 123,529 | · | · | 123,529 Direct | · | Acquired | (price as of 2026-10-02) |
| Jan. 6, 2025 | NAMSW | A | 670,467 | · | · | 670,467 Direct | · | Acquired | (price as of 2026-10-02) |
| Jan. 2, 2025 | SLN | A | 48,000 | · | · | 48,000 Direct | · | Acquired | (price as of 2026-10-02) |
| Dec. 10, 2024 | TENX | A | 100,000 | · | · | 100,000 Direct | · | Acquired | (price as of 2026-10-02) |
| Oct. 9, 2024 | NAMSW | G | 15,000 | $11.50 | $172,500 | 85,000 Direct | -15.00% | Disposed | 10.0% (price as of 2026-10-02) |
| Sept. 25, 2024 | BIOA | A | 15,000 | · | · | 15,000 Direct | · | Acquired | (price as of 2026-10-02) |
| Aug. 20, 2024 | NAMSW | P | 5,000 | $16.27 | $81,350 | 209,784 Direct | +2.44% | Acquired | -22.2% (price as of 2026-10-02) |
| Aug. 8, 2024 | TENX | P | 2,500 | · | · | 2,881 Direct | +656.17% | Acquired | (price as of 2026-10-02) |
| Aug. 8, 2024 | TENX | P | 47,500 | · | · | 47,500 Direct | · | Acquired | (price as of 2026-10-02) |
| Aug. 8, 2024 | TENX | P | 25,000 | · | · | 25,000 Direct | · | Acquired | (price as of 2026-10-02) |
| June 20, 2024 | NAMSW | P | 5,000 | $17.26 | $86,300 | 204,784 Direct | +2.50% | Acquired | -26.7% (price as of 2026-10-02) |
| March 26, 2024 | BIOA | A | 33,986 | · | · | 33,986 Direct | · | Acquired | (price as of 2026-10-02) |
| Jan. 1, 2024 | NAMSW | A | 1,039,939 | · | · | 1,039,939 Direct | · | Acquired | (price as of 2026-10-02) |
| June 9, 2022 | TENX | A | 5,000 | · | · | 5,000 Direct | · | Acquired | (price as of 2026-10-02) |
| Jan. 10, 2022 | LSTA | A | 65,430 | · | · | 209,753 Direct | +45.34% | Acquired | (price as of 2026-10-02) |
| June 11, 2021 | TENX | A | 512,000 | · | · | 606,645 Direct | +540.97% | Acquired | (price as of 2026-10-02) |
| June 11, 2021 | TENX | M | 512 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| June 10, 2021 | TENX | A | 6,250 | · | · | 6,250 Direct | · | Acquired | (price as of 2026-10-02) |
| Jan. 11, 2021 | LSTA | A | 37,735 | · | · | 144,323 Direct | +35.40% | Acquired | (price as of 2026-10-02) |
| Sept. 9, 2020 | LSTA | P | 55,525 | $1.80 | $99,945 | 106,588 Direct | +108.74% | Acquired | -94.6% (price as of 2026-10-02) |
| July 28, 2020 | LSTA | A | 51,063 | $2.35 | $119,998 | 51,063 Direct | · | Acquired | -95.8% (price as of 2026-10-02) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II) Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| June 10, 2026 | BIOA | Stock Option (Right to Buy) | Common Stock | $15.48 | June 9, 2036 | 22,000 | Acquired |
| March 2, 2026 | NAMSW | Option (right to buy) | Ordinary Shares | · | July 6, 2031 | 443,707 | Disposed |
| Feb. 26, 2026 | NAMSW | Option (right to buy) | Ordinary Shares | · | July 6, 2031 | 183,332 | Disposed |
| Feb. 25, 2026 | NAMSW | Option (right to buy) | Ordinary Shares | · | July 6, 2031 | 58,253 | Disposed |
| Feb. 24, 2026 | NAMSW | Option (right to buy) | Ordinary Shares | · | July 6, 2031 | 64,708 | Disposed |
| Jan. 9, 2026 | TENX | Stock Option (right to buy) | Common Stock | $13.30 | Jan. 9, 2036 | 30,000 | Acquired |
| Jan. 7, 2026 | NAMSW | Option (right to buy) | Ordinary Shares | $35.45 | Jan. 7, 2036 | 364,000 | Acquired |
| July 1, 2025 | TENX | Stock Option (right to buy) | Common Stock | $5.75 | July 1, 2035 | 80,000 | Acquired |
| June 5, 2025 | BIOA | Stock Option (Right to Buy) | Common Stock | $4.44 | June 4, 2035 | 22,000 | Acquired |
| March 26, 2025 | NAMSW | Restricted Stock Unit | Ordinary Shares | · | · | 38,394 | Disposed |
| March 26, 2025 | NAMSW | Restricted Stock Unit | Ordinary Shares | · | · | 38,394 | Acquired |
| Jan. 6, 2025 | NAMSW | Option (right to buy) | Ordinary Shares | $25.85 | Jan. 6, 2035 | 670,467 | Acquired |
| Jan. 2, 2025 | SLN | Share Option (Right to Buy) | Ordinary Shares | $2.40 | Jan. 2, 2035 | 48,000 | Acquired |
| Dec. 10, 2024 | TENX | Stock Option (right to buy) | Common Stock | $5.94 | Dec. 10, 2034 | 100,000 | Acquired |
| Oct. 9, 2024 | NAMSW | Warrant (right to buy) | Ordinary Shares | $11.50 | Nov. 23, 2027 | 15,000 | Disposed |
| Sept. 25, 2024 | BIOA | Stock Option (Right to Buy) | Common Stock | $18.00 | Sept. 24, 2034 | 15,000 | Acquired |
| Aug. 8, 2024 | TENX | Pre-Funded Warrant | Common Stock | $0.01 | · | 47,500 | Acquired |
| Aug. 8, 2024 | TENX | Warrant | Common Stock | $4.50 | · | 25,000 | Acquired |
| March 26, 2024 | BIOA | Stock Option (Right to Buy) | Common Stock | $8.39 | March 25, 2034 | 33,986 | Acquired |
| Jan. 1, 2024 | NAMSW | Option (right to buy) | Ordinary Shares | $11.17 | Jan. 1, 2034 | 1,039,939 | Acquired |
| June 9, 2022 | TENX | Stock Option (right to buy) | Common Stock | $0.62 | June 9, 2032 | 5,000 | Acquired |
| June 11, 2021 | TENX | Series B Preferred Stock [F1] | Common Stock | · | June 11, 2021 | 512 | Disposed |
| June 10, 2021 | TENX | Stock Option (right to buy) | Common Stock | $2.00 | June 10, 2031 | 6,250 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 13 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Jan. 2, 2025 | SLN | Ordinary Shares | 12,993 | Direct |
| Jan. 2, 2025 | SLN | Share Option (Right to Buy) | 48,000 | Direct |
| Jan. 2, 2025 | SLN | Share Option (Right to Buy) | 48,000 | Direct |
| Jan. 2, 2025 | SLN | Share Option (Right to Buy) | 48,000 | Direct |
| Sept. 25, 2024 | BIOA | Stock Option (Right to Buy) | 33,986 | Direct |
| Jan. 25, 2024 | NAMSW | Warrant (right to buy) | · | Direct |
| Dec. 29, 2023 | NAMSW | Ordinary Shares | 199,784 | Direct |
| Dec. 29, 2023 | NAMSW | Ordinary Shares | 608,779 | Indirect |
| Dec. 29, 2023 | NAMSW | Option (right to buy) | 1,021,485 | Direct |
| Dec. 29, 2023 | NAMSW | Option (right to buy) | 2,440,538 | Direct |
| Dec. 29, 2023 | NAMSW | Option (right to buy) | 989,267 | Direct |
| June 15, 2021 | TENX | Common Stock | 96,645 | Direct |
| June 15, 2021 | TENX | Series B Preferred Stock | 512 | Direct |
Compensation (DEF 14A)
Matched by name from proxy statements (DEF 14A) — verify against the filing.
| Fiscal year | Salary | Bonus | Stock awards | Option awards | Non-equity incentive | Pension change | Other | Total |
|---|---|---|---|---|---|---|---|---|
| 2025 | $646,152 | · | $3,571,146 | $8,931,566 | $474,922 | · | $18,068 | $13,641,854 |
| 2024 | $621,300 | · | · | · | $497,040 | · | $3,897 | $6,469,297 |
| 2023 | $569,000 | $313,000 | · | $4,923,558 | · | · | · | $5,832,558 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.